After playing many hours of Dungeon Hunter 2(hd) i have to say Marvel Ultimate Alliance 1/2 or even the older xmen legends titles would be perfect for an ios port....not sure who owns the rights or if they have joined the ios world but man oh man-GIMME! And from a business stand point, extra characters seem like a logical/potentially profitable iap.
Like guy above said, it'll not likely happen. ...but if it did it would be amazing. Aside from the Activision no go, Disney owns the rights to Marvel Comics and it doesn't seem Disney has released much onto the iOS areana.
Too bad, however activision is all about the $$ and ios gaming is here to stay so maybe in the not so distant future....one can dream. Either way i need me some superhero/mutant iosing!!!!